I have to disagree with your claim that the Disney website is lame because they haven't posted the Eat to the Beat concert series lineup yet. I'd call them responsible, not lame.
Disney will not post the information on their website until the schedules are confirmed. With things like Eat to the Beat talent or Candlelight narrators contracts need to be finalized and signed before anything can be announced officially. In fact, I have a feeling those same contracts have clauses that prevent Disney from announcing anything until they are official. And even then, sometimes schedule conflicts will crop up for the talent that prevents them from fulfilling their contracts. So Disney does need to wait for the contracts to be done before they'll post anything officially.
Unfortunately, there are people who have access to the proposed schedules and leak it to their buddies at websites like this one before the schedule becomes official. Now it is entirely possible that the Eat to the Beat lineup will end up being exactly as listed here; however, until all the "i's" are dotted and the "t's" are crossed, Disney won't post the information on their website.